 /*******************************************************************************
  * Copyright (c) 2000, 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.update.internal.ui.preferences;

 import java.net.*;

 import org.eclipse.core.runtime.*;
 import org.eclipse.jface.dialogs.*;
 import org.eclipse.jface.dialogs.Dialog;
 import org.eclipse.jface.preference.PreferencePage;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.BusyIndicator;
 import org.eclipse.swt.events.*;
 import org.eclipse.swt.layout.*;
 import org.eclipse.swt.widgets.*;
 import org.eclipse.ui.*;
 import org.eclipse.update.core.SiteManager;
 import org.eclipse.update.internal.core.UpdateCore;
 import org.eclipse.update.internal.operations.UpdateUtils;
 import org.eclipse.update.internal.ui.UpdateUI;
 import org.eclipse.update.internal.ui.UpdateUIMessages;

 /**
  * Insert the type's description here.
  * @see PreferencePage
  */
 public class MainPreferencePage
     extends PreferencePage
     implements IWorkbenchPreferencePage {

     //private Label historySizeLabel;
 private Text historySizeText;
     private Button checkSignatureCheckbox;
     private Button automaticallyChooseMirrorCheckbox;
     private Button equivalentButton;
     private Button compatibleButton;
     private Text updatePolicyText;

     // these two values are for compatibility with old code
 public static final String EQUIVALENT_VALUE = "equivalent"; //$NON-NLS-1$
 public static final String COMPATIBLE_VALUE = "compatible"; //$NON-NLS-1$

     /**
      * The constructor.
      */
     public MainPreferencePage() {
         super();
     }

     /**
      * Insert the method's description here.
      */
     public void init(IWorkbench workbench) {
     }

     /* (non-Javadoc)
      * Method declared on PreferencePage.
      */
     protected Control createContents(Composite parent) {
         PlatformUI.getWorkbench().getHelpSystem().setHelp(parent, "org.eclipse.update.ui.MainPreferencePage"); //$NON-NLS-1$

         Composite mainComposite = new Composite(parent, SWT.NULL);
         mainComposite.setLayoutData(new GridData(GridData.FILL_BOTH));
         GridLayout layout = new GridLayout();
         layout.marginHeight = 0;
         layout.marginWidth = 0;
         layout.numColumns = 2;
         mainComposite.setLayout(layout);

         Label historySizeLabel = new Label(mainComposite, SWT.NONE);
         historySizeLabel.setText(UpdateUIMessages.MainPreferencePage_historySize);
         historySizeText = new Text(mainComposite, SWT.SINGLE | SWT.BORDER);
         historySizeText.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
         historySizeText.addModifyListener(new ModifyListener() {
             public void modifyText(ModifyEvent e) {
                 historySizeChanged();
             }
         });

         checkSignatureCheckbox =
             new Button(mainComposite, SWT.CHECK | SWT.LEFT);
         checkSignatureCheckbox.setText(UpdateUIMessages.MainPreferencePage_checkSignature);
         GridData gd = new GridData(GridData.FILL_HORIZONTAL);
         gd.horizontalSpan = 2;
         checkSignatureCheckbox.setLayoutData(gd);
         checkSignatureCheckbox.addSelectionListener(new SelectionAdapter() {
             public void widgetSelected(SelectionEvent e) {
                 if (checkSignatureCheckbox.getSelection() == false) {
                     warnSignatureCheck(getShell());
                 }
             }
         });
         
         automaticallyChooseMirrorCheckbox =
             new Button(mainComposite, SWT.CHECK | SWT.LEFT);
         automaticallyChooseMirrorCheckbox.setText(UpdateUIMessages.MainPreferencePage_automaticallyChooseMirror);
         gd = new GridData();
         gd.horizontalSpan = 2;
         automaticallyChooseMirrorCheckbox.setLayoutData(gd);

         createSpacer(mainComposite, 2);

         Group group = new Group(mainComposite, SWT.NONE);
         group.setText(UpdateUIMessages.MainPreferencePage_updateVersions);
         group.setLayout(new GridLayout());
         gd = new GridData(GridData.FILL_HORIZONTAL);
         gd.horizontalSpan = 2;
         group.setLayoutData(gd);

         equivalentButton = new Button(group, SWT.RADIO);
         equivalentButton.setText(UpdateUIMessages.MainPreferencePage_updateVersions_equivalent);

         compatibleButton = new Button(group, SWT.RADIO);
         compatibleButton.setText(UpdateUIMessages.MainPreferencePage_updateVersions_compatible);

         createSpacer(mainComposite, 2);

         group = new Group(mainComposite, SWT.NONE);
         group.setText(UpdateUIMessages.MainPreferencePage_updatePolicy);
         layout = new GridLayout();
         layout.numColumns = 2;
         group.setLayout(layout);
         gd = new GridData(GridData.FILL_HORIZONTAL);
         gd.horizontalSpan = 2;
         group.setLayoutData(gd);

         Label label = new Label(group, SWT.NULL);
         label.setText(UpdateUIMessages.MainPreferencePage_updatePolicyURL);
         updatePolicyText = new Text(group, SWT.SINGLE | SWT.BORDER);

         gd = new GridData(GridData.FILL_HORIZONTAL);
         updatePolicyText.setLayoutData(gd);

         //createSpacer(mainComposite, 2);
 //createHttpProxy(mainComposite, 2);
 initialize();
         updatePolicyText.addModifyListener(new ModifyListener() {
             public void modifyText(ModifyEvent e) {
                 textChanged();
             }
         });
         return mainComposite;
     }

     public void createControl(Composite parent) {
         super.createControl(parent);
         Dialog.applyDialogFont(getControl());
     }

     protected void createSpacer(Composite composite, int columnSpan) {
         Label label = new Label(composite, SWT.NONE);
         GridData gd = new GridData();
         gd.horizontalSpan = columnSpan;
         label.setLayoutData(gd);
     }

     protected void createHttpProxy(Composite composite, int columnSpan) {
         Group group = new Group(composite, SWT.NONE);
         group.setText(UpdateUIMessages.MainPreferencePage_proxyGroup);
         GridLayout layout = new GridLayout();
         layout.numColumns = 2;
         group.setLayout(layout);
         GridData gd = new GridData(GridData.FILL_HORIZONTAL);
         gd.horizontalSpan = columnSpan;
         group.setLayoutData(gd);
     }

     private int getHistoryCount() {
         try {
             Integer count = new Integer (historySizeText.getText());
             return count.intValue();
         } catch (NumberFormatException e) {
         }
         return UpdateCore.getPlugin().getPluginPreferences().getDefaultInt(
             UpdateCore.P_HISTORY_SIZE);
     }
     
     private void historySizeChanged() {
         
         try {
             int historySize = Integer.parseInt(historySizeText.getText());
             if (historySize < 0) {
                 setValid(false);
                 setErrorMessage(UpdateUIMessages.MainPreferencePage_invalidHistorySize);
                 return;
             }
         } catch (NumberFormatException e) {
             setValid(false);
             setErrorMessage(UpdateUIMessages.MainPreferencePage_invalidHistorySize);
             return;
         }
         setValid(true);
         setErrorMessage(null);
     }

     public boolean performOk() {
         BusyIndicator.showWhile(getControl().getDisplay(), new Runnable () {
             public void run() {
                 try {
                     SiteManager.getLocalSite().setMaximumHistoryCount(
                         getHistoryCount());
                 } catch (CoreException e) {
                     UpdateUI.logException(e);
                 }
             }
         });

         Preferences prefs = UpdateCore.getPlugin().getPluginPreferences();
         prefs.setValue(
             UpdateCore.P_CHECK_SIGNATURE,
             checkSignatureCheckbox.getSelection());
         prefs.setValue(UpdateCore.P_AUTOMATICALLY_CHOOSE_MIRROR, automaticallyChooseMirrorCheckbox.getSelection());
         prefs.setValue(UpdateCore.P_HISTORY_SIZE, historySizeText.getText());
         prefs.setValue(
             UpdateCore.P_UPDATE_VERSIONS,
             equivalentButton.getSelection()
                 ? EQUIVALENT_VALUE
                 : COMPATIBLE_VALUE);
         prefs.setValue(
             UpdateUtils.P_UPDATE_POLICY_URL,
             updatePolicyText.getText());

         UpdateCore.getPlugin().savePluginPreferences();
         return super.performOk();
     }


     private void initialize() {
         Preferences prefs = UpdateCore.getPlugin().getPluginPreferences();

         checkSignatureCheckbox.setSelection(
             prefs.getBoolean(UpdateCore.P_CHECK_SIGNATURE));
         automaticallyChooseMirrorCheckbox.setSelection(
                 prefs.getBoolean(UpdateCore.P_AUTOMATICALLY_CHOOSE_MIRROR));

         historySizeText.setText(prefs.getString(UpdateCore.P_HISTORY_SIZE));

         boolean isCompatible =
             UpdateCore.COMPATIBLE_VALUE.equals(
                 prefs.getString(UpdateCore.P_UPDATE_VERSIONS));
         equivalentButton.setSelection(!isCompatible);
         compatibleButton.setSelection(isCompatible);

         String text = prefs.getString(UpdateUtils.P_UPDATE_POLICY_URL);
         updatePolicyText.setText(text);
     }

     private void textChanged() {
         String text = updatePolicyText.getText();
         if (text.length() > 0) {
             try {
                 new URL(text);
             } catch (MalformedURLException e) {
                 setValid(false);
                 setErrorMessage(UpdateUIMessages.UpdateSettingsPreferencePage_invalid);
                 return;
             }
         }
         setValid(true);
         setErrorMessage(null);
     }

     public void performDefaults() {
         super.performDefaults();
         Preferences prefs = UpdateCore.getPlugin().getPluginPreferences();

         updatePolicyText.setText(""); //$NON-NLS-1$

         checkSignatureCheckbox.setSelection(true);
         automaticallyChooseMirrorCheckbox.setSelection(false);
         historySizeText.setText(
             prefs.getDefaultString(UpdateCore.P_HISTORY_SIZE));
         
         equivalentButton.setSelection(true);
         compatibleButton.setSelection(false);
     }

     private void warnSignatureCheck(Shell shell) {
         MessageDialog.openWarning(shell, UpdateUIMessages.MainPreferencePage_digitalSignature_title,
         UpdateUIMessages.MainPreferencePage_digitalSignature_message);
     }
 }

